Conservation areas protect biodiversity and ecosystems from human activities and climate change threats. Understanding disturbances that can damage conservation areas drives the need for effective mapping and monitoring. One of the primary disturbances is land cover change caused by forest fires, illegal logging, and other human activities. In this context, remote sensing algorithms such as LandTrendr offer an efficient approach to monitoring vegetation changes and disturbances in conservation areas. This study aims to monitor vegetation changes and disturbances in Gunung Merbabu National Park using the LandTrendr algorithm. Landsat image data from 1994 to 2023 was analyzed using Google Earth Engine. The results showed that the LandTrendr algorithm effectively identified vegetation changes, with forest fires being the primary disturbance. During 1994-2022, total vegetation loss and gain were detected at 933.57 Ha and 2279.52 Ha, respectively. The results highlight significant changes in the core zone of Gunung Merbabu National Park, mainly due to fires and logging activities. These findings provide a better understanding of the dynamics of vegetation change in Gunung Merbabu National Park and provide relevant insights for conservation area managers to implement appropriate mitigation measures. This research contributes to the literature on monitoring vegetation changes in conservation areas and provides a basis for more effective conservation efforts in Gunung Merbabu National Park and similar areas.